My advice? Ask the sommelier. Be honest about your normal tastes. If you prefer £5 bottles from the supermarket, let them know.
If you can tell the difference between a Chassagne Montrachet 2000 and a Puligny Montrachet 2002, let them know.
As a couple we went to the Fat Duck a couple of years ago. I gave the waiter a budget, told them what we like and let them decide what would go best with the meal. I think we started with a glass of fizz (it was Champagne as it happens) and then had other stuff through the meal.
I did the same at a fancy resto in France a couple of weeks ago.
If you especially want a particular wine, then of course you have to select that one, and I'm sure you will enjoy the experience.
Half the pleasure is in anticipation , so do what you feel most confortable with ... and Santé